docs: def _update_what(self):
          """
          set what this thing is! "instance of (P31)"
          """
          if 'P31' not in self.data['claims']:  # missing Wikidata
              msg = ("Note: Wikidata item %s" % self.data['wikibase'],
                     "missing 'instance of' (P31)")
              utils.stderr(" ".join(msg))
              return
  
          instance_of = self.data['claims']['P31'][0]
          labels = self.data['labels']
  
          if instance_of in labels:
              self.data['what'] = labels[instance_of]